feat(simulation): add NPC name masking with role labels and color index

Server-side infrastructure for information asymmetry in dialogue.
NPCs display role labels (Worker, Supervisor, Patron) instead of
real names until the player explicitly learns them via KG lookup.
NpcColorIndex (stable_id % 8) persists across name reveal.

ConversationEvent and DialogueResponseEvent carry display names +
color indices on the wire with serde(default) for compat.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/bridge/text_renderer.rs

@@ -363,6 +363,8 @@ mod tests {
             line_id: "line_test".into(),
             text: "Welcome to the docks.".into(),
             speaker_entity_id: 100,
+            speaker_color_index: 0,
+            speaker_name: "Dock Worker".into(),
         });
         let text = format_snapshot_text(&snap);
         assert!(text.contains("Dialogue: [npc:100] \"Welcome to the docks.\""));

server/src/bridge/types.rs

@@ -358,6 +358,9 @@ pub enum PlayerAction {
     ToggleStanceUp,
     /// Move one step down the stance ladder (toward Crouch) per D-053
     ToggleStanceDown,
+    /// Update player facing without movement (D-054). Client sends when
+    /// the player turns in place (e.g. mouse aim, turn keys).
+    SetFacing { facing: String },
     /// Teleport player to the Gauntlet hub spawn point (#491).
     /// Clears dialogue, monologue, and interaction buffers.
     /// Rejected with a log warning on non-Gauntlet maps.
@@ -500,6 +503,12 @@ pub struct DialogueResponseEvent {
     pub text: String,
     /// Wire-format entity identifier of the speaking NPC
     pub speaker_entity_id: u64,
+    /// Color index (0-7) for the speaker's dialogue box header.
+    #[serde(default)]
+    pub speaker_color_index: u8,
+    /// Display name of the speaker (real name if known to player, else role label).
+    #[serde(default)]
+    pub speaker_name: String,
 }
 
 /// Snapshot buffer resource for staging outgoing ObserverSnapshots